actions - Read For Learn

When to use add_action(‘init’) vs add_action(‘wp_enqueue_scripts’)

A lot of plugin developers don’t do things the right way. The right way is to hook on to wp_enqueue_scripts like you’re trying to do. However, here’s the order of the hooks run in a typical request: muplugins_loaded registered_taxonomy registered_post_type plugins_loaded sanitize_comment_cookies setup_theme load_textdomain after_setup_theme auth_cookie_malformed auth_cookie_valid set_current_user init widgets_init register_sidebar wp_register_sidebar_widget wp_default_scripts wp_default_stypes admin_bar_init … Read more

How to do_action and get a return value?

The cool thing is a filter is the same as an action, only it returns a value, so just set it up as a filter instead: add_filter( ‘myplugin_clean_logs’, array( ‘MyPlugin_Logs’, ‘clean_logs’ ) ); Then something like: $affected_rows=””; $affected_rows = apply_filters( ‘myplugin_clean_logs’, $affected_rows ); should pass $affected_rows to clean_logs() (and whatever other functions you may have … Read more

What action should I hook into when adding roles and capabilities?

When adding a role and capabilities you only need to run the code once since the roles and capabilities are saved to the database when using add_role or ->add_cap functions so just like Andy said you can use after_setup_theme for this kind of action but add some kind of check so it only runs once, … Read more

How to pass parameters to admin_notices?

I think a better implementation would be a “message” class e.g.: class WPSE_224485_Message { private $_message; function __construct( $message ) { $this->_message = $message; add_action( ‘admin_notices’, array( $this, ‘render’ ) ); } function render() { printf( ‘<div class=”updated”>%s</div>’, $this->_message ); } } This allows you to instantiate the message at any time prior to rendering: … Read more

after_setup_theme always runs

SOLUTION: after_switch_theme does exactly what I intended here. It fires after the theme is switched TO your theme. One of the solutions mentioned below uses switch_theme. This does not have the desired results, since it only happens upon switching away from your theme. Here is an article that I found as reference: http://core.trac.wordpress.org/ticket/7795#comment:29 Here is … Read more

wp_headers vs send_headers. When to use each?

Ok so I think I figured it out… Both of these work for the most part as you’d expect by sending http / php headers to the browser. wp_headers is actually a filter inside the send_headers() functions.You can use this to modify the headers before they’re sent to the browser with some exception. wp_headers won’t … Read more

Remove Actions/Filters added via Anonymous Functions

The problem is that you can’t distinguish form an anonymous function and another, so yes, it is possible to remove a closure (i.e. anonymous function) but if more than one closure act on same filter at same priority you have to make a choice, remove them all, ore remove only one (without knowing exactly which). … Read more

Difference between after_setup_theme and init action hooks?

after_setup_theme action hook is fired before the actual $wp->init(); which Set up the current user and only then init action hook is fired which means that they are pretty much the same with one major difference and that is at after_setup_theme the user is not authenticated, and at init he is (assuming that we are … Read more

Where is the best place to use add_filter

add_filter() and add_action() are available before any plugin is loaded. So you can use both in the first line of your plugin or theme. For readability I recommend to group action and filter registrations at the very top of your main file: in a plugin, the file with the plugin header in a theme the … Read more

Why do some hooks not work inside class context?

Sometimes certain hooks need to be fired at certain times. Example, some hooks need to be fired upon init. Add this to your __construct() add_action(‘init’, array(&$this, ‘init’)); Then add this function, which will contain all hooks that need to be fired upon init. public function init(){ add_action(‘hook_name’, array(&$this, ‘your_method_name’)); add_action(‘hook_name’, array(&$this, ‘your_method_name’)); add_action(‘hook_name’, array(&$this, ‘your_method_name’)); … Read more

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